* {
    margin: 0;
    padding: 0;
}

.tb-promo {
    position: relative;
    width: 520px;
    height: 280px;
    /* background-color: pink; */
    margin: 100px auto;
}

.tb-promo img {
    width: 520px;
    height: 280px;
}

.prev {
    position: absolute;
    left: 0;
    top: 50%;
    margin-top: -15px;
    width: 20px;
    height: 30px;
    background: rgba(0, 0, 0, .2);
    text-align: center;
    line-height: 30px;
    color: #fff;
    border-top-right-radius: 15px;
    border-bottom-right-radius: 15px;
}

a {
    text-decoration: none;
}

.next {
    position: absolute;
    right: 0;
    top: 50%;
    margin-top: -15px;
    width: 20px;
    height: 30px;
    background: rgba(0, 0, 0, .2);
    text-align: center;
    line-height: 30px;
    color: #fff;
    border-top-left-radius: 15px;
    border-bottom-left-radius: 15px;
}
/* 小圆点显示 */
.promo-nav {
    position: absolute;
    bottom: 15px;
    left: 50%;
    margin-left: -35px;
    width: 70px;
    height: 13px;
    background-color: pink;
    background: rgba(255, 255, 255, .3);
    border-radius: 7px;
}

.promo-nav li {
    float: left;
    width: 8px;
    height: 8px;
    background-color: #fff;
    border-radius: 50%;
    margin: 3px 3px 3px 3px;
}
li {
    list-style: none;
}
   .promo-nav .selected {
    background-color: #ff5000;
 

}
